/*******************************
         Install Task
*******************************/

/*
   Install tasks

   For more notes

   * Runs automatically after npm update (hooks)
   * (NPM) Install - Will ask for where to put semantic (outside pm folder)
   * (NPM) Upgrade - Will look for semantic install, copy over files and update if new version
   * Standard installer runs asking for paths to site files etc

*/

var gulp = require("gulp"),
  // node dependencies
  console = require("better-console"),
  extend = require("extend"),
  fs = require("fs"),
  mkdirp = require("mkdirp"),
  path = require("path"),
  runSequence = require("run-sequence"),
  // gulp dependencies
  chmod = require("gulp-chmod"),
  del = require("del"),
  jsonEditor = require("gulp-json-editor"),
  plumber = require("gulp-plumber"),
  prompt = require("prompt-sui"),
  rename = require("gulp-rename"),
  replace = require("gulp-replace"),
  requireDotFile = require("require-dot-file"),
  wrench = require("wrench-sui"),
  // install config
  install = require("./config/project/install"),
  // user config
  config = require("./config/user"),
  // release config (name/title/etc)
  release = require("./config/project/release"),
  // shorthand
  questions = install.questions,
  files = install.files,
  folders = install.folders,
  regExp = install.regExp,
  settings = install.settings,
  source = install.source;

// Export install task
module.exports = function(callback) {
  var currentConfig = requireDotFile("semantic.json"),
    manager = install.getPackageManager(),
    rootQuestions = questions.root,
    installFolder = false,
    answers;

  console.clear();

  /* Test NPM install
manager = {
  name : 'NPM',
  root : path.normalize(__dirname + '/../')
};
*/

  /* Don't do end user config if SUI is a sub-module */
  if (install.isSubModule()) {
    console.info("SUI is a sub-module, skipping end-user install");
    return;
  }

  /*-----------------
    Update SUI
-----------------*/

  // run update scripts if semantic.json exists
  if (currentConfig && manager.name === "NPM") {
    var updateFolder = path.join(manager.root, currentConfig.base),
      updatePaths = {
        config: path.join(manager.root, files.config),
        tasks: path.join(updateFolder, folders.tasks),
        themeImport: path.join(updateFolder, folders.themeImport),
        definition: path.join(currentConfig.paths.source.definitions),
        site: path.join(currentConfig.paths.source.site),
        theme: path.join(currentConfig.paths.source.themes),
        defaultTheme: path.join(
          currentConfig.paths.source.themes,
          folders.defaultTheme
        )
      };

    // duck-type if there is a project installed
    if (fs.existsSync(updatePaths.definition)) {
      // perform update if new version
      if (currentConfig.version !== release.version) {
        console.log(
          "Updating Semantic UI from " +
            currentConfig.version +
            " to " +
            release.version
        );

        console.info("Updating ui definitions...");
        wrench.copyDirSyncRecursive(
          source.definitions,
          updatePaths.definition,
          settings.wrench.overwrite
        );

        console.info("Updating default theme...");
        wrench.copyDirSyncRecursive(
          source.themes,
          updatePaths.theme,
          settings.wrench.merge
        );
        wrench.copyDirSyncRecursive(
          source.defaultTheme,
          updatePaths.defaultTheme,
          settings.wrench.overwrite
        );

        console.info("Updating tasks...");
        wrench.copyDirSyncRecursive(
          source.tasks,
          updatePaths.tasks,
          settings.wrench.overwrite
        );

        console.info("Updating gulpfile.js");
        gulp
          .src(source.userGulpFile)
          .pipe(plumber())
          .pipe(gulp.dest(updateFolder));

        // copy theme import
        console.info("Updating theme import file");
        gulp
          .src(source.themeImport)
          .pipe(plumber())
          .pipe(gulp.dest(updatePaths.themeImport));

        console.info("Adding new site theme files...");
        wrench.copyDirSyncRecursive(
          source.site,
          updatePaths.site,
          settings.wrench.merge
        );

        console.info("Updating version...");

        // update version number in semantic.json
        gulp
          .src(updatePaths.config)
          .pipe(plumber())
          .pipe(rename(settings.rename.json)) // preserve file extension
          .pipe(
            jsonEditor({
              version: release.version
            })
          )
          .pipe(gulp.dest(manager.root));

        console.info(
          'Update complete! Run "\x1b[92mgulp build\x1b[0m" to rebuild dist/ files.'
        );

        return;
      } else {
        console.log("Current version of Semantic UI already installed");
        return;
      }
    } else {
      console.error(
        "Cannot locate files to update at path: ",
        updatePaths.definition
      );
      console.log("Running installer");
    }
  }

  /*--------------
 Determine Root
---------------*/

  // PM that supports Build Tools (NPM Only Now)
  if (manager.name == "NPM") {
    rootQuestions[0].message = rootQuestions[0].message
      .replace(
        "{packageMessage}",
        "We detected you are using " + manager.name + " Nice!"
      )
      .replace("{root}", manager.root);
    // set default path to detected PM root
    rootQuestions[0].default = manager.root;
    rootQuestions[1].default = manager.root;

    // insert PM questions after "Install Type" question
    Array.prototype.splice.apply(questions.setup, [2, 0].concat(rootQuestions));

    // omit cleanup questions for managed install
    questions.cleanup = [];
  }

  /*--------------
   Create SUI
---------------*/

  gulp.task("run setup", function() {
    // If auto-install is switched on, we skip the configuration section and simply reuse the configuration from semantic.json
    if (install.shouldAutoInstall()) {
      answers = {
        overwrite: "yes",
        install: "auto",
        useRoot: true,
        semanticRoot: currentConfig.base
      };
    } else {
      return gulp.src("gulpfile.js").pipe(
        prompt.prompt(questions.setup, function(setupAnswers) {
          // hoist
          answers = setupAnswers;
        })
      );
    }
  });

  gulp.task("create install files", function(callback) {
    /*--------------
   Exit Conditions
  ---------------*/

    // if config exists and user specifies not to proceed
    if (answers.overwrite !== undefined && answers.overwrite == "no") {
      return;
    }
    console.clear();
    if (install.shouldAutoInstall()) {
      console.log("Auto-Installing (Without User Interaction)");
    } else {
      console.log("Installing");
    }
    console.log("------------------------------");

    /*--------------
        Paths
  ---------------*/

    var installPaths = {
      config: files.config,
      configFolder: folders.config,
      site: answers.site || folders.site,
      themeConfig: files.themeConfig,
      themeConfigFolder: folders.themeConfig
    };

    /*--------------
    NPM Install
  ---------------*/

    // Check if PM install
    if (manager && (answers.useRoot || answers.customRoot)) {
      // Set root to custom root path if set
      if (answers.customRoot) {
        if (answers.customRoot === "") {
          console.log("Unable to proceed, invalid project root");
          return;
        }
        manager.root = answers.customRoot;
      }

      // special install paths only for PM install
      installPaths = extend(false, {}, installPaths, {
        definition: folders.definitions,
        lessImport: folders.lessImport,
        tasks: folders.tasks,
        theme: folders.themes,
        defaultTheme: path.join(folders.themes, folders.defaultTheme),
        themeImport: folders.themeImport
      });

      // add project root to semantic root
      installFolder = path.join(manager.root, answers.semanticRoot);

      // add install folder to all output paths
      for (var destination in installPaths) {
        if (installPaths.hasOwnProperty(destination)) {
          // config goes in project root, rest in install folder
          installPaths[destination] =
            destination == "config" || destination == "configFolder"
              ? path.normalize(
                  path.join(manager.root, installPaths[destination])
                )
              : path.normalize(
                  path.join(installFolder, installPaths[destination])
                );
        }
      }

      // create project folders
      try {
        mkdirp.sync(installFolder);
        mkdirp.sync(installPaths.definition);
        mkdirp.sync(installPaths.theme);
        mkdirp.sync(installPaths.tasks);
      } catch (error) {
        console.error(
          'NPM does not have permissions to create folders at your specified path. Adjust your folders permissions and run "npm install" again'
        );
      }

      console.log("Installing to \x1b[92m" + answers.semanticRoot + "\x1b[0m");

      console.info("Copying UI definitions");
      wrench.copyDirSyncRecursive(
        source.definitions,
        installPaths.definition,
        settings.wrench.overwrite
      );

      console.info("Copying UI themes");
      wrench.copyDirSyncRecursive(
        source.themes,
        installPaths.theme,
        settings.wrench.merge
      );
      wrench.copyDirSyncRecursive(
        source.defaultTheme,
        installPaths.defaultTheme,
        settings.wrench.overwrite
      );

      console.info("Copying gulp tasks");
      wrench.copyDirSyncRecursive(
        source.tasks,
        installPaths.tasks,
        settings.wrench.overwrite
      );

      // copy theme import
      console.info("Adding theme files");
      gulp
        .src(source.themeImport)
        .pipe(plumber())
        .pipe(gulp.dest(installPaths.themeImport));
      gulp
        .src(source.lessImport)
        .pipe(plumber())
        .pipe(gulp.dest(installPaths.lessImport));

      // create gulp file
      console.info("Creating gulpfile.js");
      gulp
        .src(source.userGulpFile)
        .pipe(plumber())
        .pipe(gulp.dest(installFolder));
    }

    /*--------------
     Site Theme
  ---------------*/

    // Copy _site templates folder to destination
    if (fs.existsSync(installPaths.site)) {
      console.info(
        "Site folder exists, merging files (no overwrite)",
        installPaths.site
      );
    } else {
      console.info("Creating site theme folder", installPaths.site);
    }
    wrench.copyDirSyncRecursive(
      source.site,
      installPaths.site,
      settings.wrench.merge
    );

    /*--------------
    Theme Config
  ---------------*/

    gulp.task("create theme.config", function() {
      var // determine path to site theme folder from theme config
        // force CSS path variable to use forward slashes for paths
        pathToSite = path
          .relative(
            path.resolve(installPaths.themeConfigFolder),
            path.resolve(installPaths.site)
          )
          .replace(/\\/g, "/"),
        siteVariable = "@siteFolder   : '" + pathToSite + "/';";

      // rewrite site variable in theme.less
      console.info("Adjusting @siteFolder to: ", pathToSite + "/");

      if (fs.existsSync(installPaths.themeConfig)) {
        console.info(
          "Modifying src/theme.config (LESS config)",
          installPaths.themeConfig
        );
        return gulp
          .src(installPaths.themeConfig)
          .pipe(plumber())
          .pipe(replace(regExp.siteVariable, siteVariable))
          .pipe(gulp.dest(installPaths.themeConfigFolder));
      } else {
        console.info(
          "Creating src/theme.config (LESS config)",
          installPaths.themeConfig
        );
        return gulp
          .src(source.themeConfig)
          .pipe(plumber())
          .pipe(rename({ extname: "" }))
          .pipe(replace(regExp.siteVariable, siteVariable))
          .pipe(gulp.dest(installPaths.themeConfigFolder));
      }
    });

    /*--------------
    Semantic.json
  ---------------*/

    gulp.task("create semantic.json", function() {
      var jsonConfig = install.createJSON(answers);

      // adjust variables in theme.less
      if (fs.existsSync(installPaths.config)) {
        console.info(
          "Extending config file (semantic.json)",
          installPaths.config
        );
        return gulp
          .src(installPaths.config)
          .pipe(plumber())
          .pipe(rename(settings.rename.json)) // preserve file extension
          .pipe(jsonEditor(jsonConfig))
          .pipe(gulp.dest(installPaths.configFolder));
      } else {
        console.info(
          "Creating config file (semantic.json)",
          installPaths.config
        );
        return gulp
          .src(source.config)
          .pipe(plumber())
          .pipe(rename({ extname: "" })) // remove .template from ext
          .pipe(jsonEditor(jsonConfig))
          .pipe(gulp.dest(installPaths.configFolder));
      }
    });

    runSequence("create theme.config", "create semantic.json", callback);
  });

  gulp.task("clean up install", function() {
    // Completion Message
    if (installFolder && !install.shouldAutoInstall()) {
      console.log(
        "\n Setup Complete! \n Installing Peer Dependencies. \x1b[0;31mPlease refrain from ctrl + c\x1b[0m... \n After completion navigate to \x1b[92m" +
          answers.semanticRoot +
          '\x1b[0m and run "\x1b[92mgulp build\x1b[0m" to build'
      );
      process.exit(0);
    } else {
      console.log("");
      console.log("");
    }

    // If auto-install is switched on, we skip the configuration section and simply build the dependencies
    if (install.shouldAutoInstall()) {
      return gulp.start("build");
    } else {
      return gulp.src("gulpfile.js").pipe(
        prompt.prompt(questions.cleanup, function(answers) {
          if (answers.cleanup == "yes") {
            del(install.setupFiles);
          }
          if (answers.build == "yes") {
            gulp.start("build");
          }
        })
      );
    }
  });

  runSequence(
    "run setup",
    "create install files",
    "clean up install",
    callback
  );
};
